diff --git a/app/models/tag.rb b/app/models/tag.rb
index e692922ca..b9f3ffdb8 100644
--- a/app/models/tag.rb
+++ b/app/models/tag.rb
@@ -160,7 +160,7 @@ class Tag < ActiveRecord::Base
 
   module ParseMethods
     def normalize(query)
-      query.to_s.strip
+      query.to_s.downcase.strip
     end
 
     def scan_query(query)